[Gdal-dev] MrSID, ECW formats unusable when RasterIO is used - GDAL 1.3.1

[Chapman, Martin]

Sergey,

We had the same problem in 1.3.1.  You need to upgrade to the latest
version of GDAL and use the MrSID version 5.x SDK.  That problem has
been fixed.

Martin

-----Original Message-----
From: gdal-dev-bounces at lists.maptools.org
[mailto:gdal-dev-bounces at lists.maptools.org] On Behalf Of Frank
Warmerdam
Sent: Wednesday, January 18, 2006 2:27 PM
To: Sergey Malgin
Cc: gdal-dev at lists.maptools.org
Subject: Re: [Gdal-dev] MrSID,ECW formats unusable when RasterIO is used
- GDAL 1.3.1

On 1/18/06, Sergey Malgin <smalgin at esri.com> wrote:
> It looks like RasterIO method doesn't use MrSID multiresolution
support. It
> takes 80 seconds to get data from 3.5MB SID file. I am trying to get
full
> extent with output dimensions set to approx. 500x500 pixels.

Sergey,

There were some quirks with multiresolution level selection that may
have still existed in the code in 1.3.1.  You might want to try a
nightly
snapshot of GDAL and see if the problem persists.  If it does, please
submit a minimal program, a file and any supported needed details
for me to reproduce the problem.

> 2. ECW problem.
>
> I have 2.5GB ECW. It shows full extent very fast, but when I zoom in a
> little, I get back blank image! If I continue to zoom in, eventually I
get
> the data from lowest pyramid level.

I haven't encountered anything like this.  Once again, I
would suggest you try a nightly snapshot.  What version of
the ECW SDK are you using?

Best regards,
--
---------------------------------------+--------------------------------
------
I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

_______________________________________________
Gdal-dev mailing list
Gdal-dev at lists.maptools.org
http://lists.maptools.org/mailman/listinfo/gdal-dev